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Supplementary Information Foreign Currency Exchange (Loss) Gain (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Foreign Currency Exchange (Loss) Gain [Line Items] |  |  |
Foreign Currency Transaction (Loss) Gain, before Tax | $ (32) | $ (132) |
Foreign Currency Transaction (Loss) Gain Tax Benefit | 2 | 74 |
Foreign Currency Transaction (Loss) Gain After Tax | (30) | (58) |
Subsidiary Monetary Position |  |  |
Foreign Currency Exchange (Loss) Gain [Line Items] |  |  |
Foreign Currency Transaction (Loss) Gain, before Tax | (23) | 49 |
Foreign Currency Transaction (Loss) Gain Tax Benefit | 0 | 32 |
Foreign Currency Transaction (Loss) Gain After Tax | (23) | 81 |
Hedging Program [Member] |  |  |
Foreign Currency Exchange (Loss) Gain [Line Items] |  |  |
Foreign Currency Transaction (Loss) Gain, before Tax | (9) | (181) | [1]
Foreign Currency Transaction (Loss) Gain Tax Benefit | 2 | 42 |
Foreign Currency Transaction (Loss) Gain After Tax | $ (7) | (139) |
Tax Reform Foreign Currency Exchange Impact [Member] | Hedging Program [Member] |  |  |
Foreign Currency Exchange (Loss) Gain [Line Items] |  |  |
Foreign Currency Transaction (Loss) Gain, before Tax |  | $ 50 |
[1] | Includes a $50 million foreign exchange loss for the three months ended March 31, 2018 related to adjustments to foreign currency exchange contracts as a result of U.S. tax reform.

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- Definition Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109240200&loc=d3e30700-110894 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109240200&loc=d3e30690-110894 + Details
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